Helix Well Ops Talisman - Helix Energy Solutions

Helix Performance Profile
Helix Well Ops
Talisman
The MSV Seawell completed a multi-well campaign
in early 2012 for Talisman Energy Inc.
objective
Helix Energy Solutions Group, Inc.’s well intervention subsidiary, Helix Well Ops (U.K.), was
contracted by Talisman Energy Inc. to execute a series of well maintenance, production
Quick Stats
Highlander: Remedial subsurface safety
valve operations
enhancement, and decommissioning workscopes on five different wells in the UKCS sector
of the North Sea in the winter of 2012. Over the course of the 68-day operation, Helix
Well Ops successfully performed the following tasks on Talisman fields:
Tartan: Well suspension and well integrity
operations
Enoch-South Wood: Three plug and
abandonment (P&A) operations with
wellhead removal
Tweedsmuir: Pumping and scale-squeeze
operations
Claymore: Mechanical repair, well
maintenance, and integrity operations
This map details the locations of the Talisman subsea wells worked on during the campaign.
h e l i x w e l l o p s ta l i s m a n
TEC H N O L O G Y
Helix Well Ops carried out the Talisman operations on the monohull intervention
vessel MSV Seawell due to her ability to support multiple work programs and transit
quickly between the different well sites in the program. Subsea, Helix Well Ops’
5-1⁄8” Subsea Intervention Lubricator (SIL) was used throughout the campaign to
facilitate tree and well access in smaller-bore installations. Due to the Tartan well
being a Horizontal Christmas Tree (HXT) rather than a Conventional (Deul-bore)
Christmas Tree, the larger 7-1⁄16” SIL was necessary for this well intervention
well-work, in order to access the well and plug and suspend the well safely.
O P E R ATIO N S H I G H L I G H T S
Highlander Remedial Subsurface Safety Valve Operations
• 13.4 days in field
•D
eployed and tested the Subsea Intervention Lubricator (SIL) in order to
conduct light well intervention
• S afety valve hold-open sleeve successfully installed, and
two contingency packers run
Results: The primary objective of setting a sleeve to hold-open the TRSCSSV was
successfully completed. However, due to an obstruction in the well, the secondary
objective of logging and re-perforating was aborted.
Tartan Well Suspension / Well Integrity Operations
• 15.4 days in the field
Results: Using slickline and e-line tooling, Well Ops successfully accessed the Tartan
well, set plugs and suspended the well with minimal downtime.
Seawell’s crew readying the IRS for deployment.
• Slickline set plug and prong set via slicking in the tailpipe nipple at 13,499ft
• Slickline set plug and prong in the TRSCSSV nipple at 662ft
• E -Line set ‘environmental’ Retrievable Bridge Plug (RBP) below the tubing
hanger at 450ft
Enoch/South Wood P&A Operations with Wellhead Removal
• 15 days in the field
• Rig up & deploy Well Abandonment Straddle Packer (WASP) tool c/w perforating guns
• Remove debris cap and clean tree cap hub
• Mix and pump cement plug into “A” Annulus & 9.625” Casing
• Pull & recover Wellhead to vessel
Results: Completed the permanent abandonment of 3 wells and temporary
and permanent guide-base recoveries.
Tweedsmuir: Pumping and Scale-squeeze Operations
• 7.5 days in the field
• Successfully spotted 1st stage of Chemical Dissolver soak
• Conducted survey work of Manifold during 1st stage
soak period
• Flush 1st stage and spot 2nd stage of Chemical Dissolver
• Pump Scale Squeeze treatment
• Flush 2nd stage of Chemical Dissolver
Results: Successfully carried out a scale squeeze of the TP1
well, along with a chemical dissolver soak of the Tweedsmuir
Production Manifold Multi-Phase Flow Meter (MPFM) and general
survey work of the manifold.
Claymore: Mechanical Repair, Well Maintenance,
and Integrity Operations
A recovered subsea tree on board the Seawell’s deck.
• 14.9 days in the field
• Intervened well & confirmed well was sub-hydrostatic
• E-line & Archer Calliper run-in-hole (RIH) to obstruction / parted
tubing @ 4250ft – tubing integrity above the Hold Up Depth
(HUD) appeared intact
• Recovered redundant spool pieces
Results: Due to downhole problems it was not possible to install
barriers to allow the removal of the old tree. In-hole work
gathered essential information on the obstruction (parted tubing)
to allow Talisman to plan future operations. All spools were
successfully recovered.
C A M PA I G N S U M M A R Y
Mobilization
• Five mobilizations in total
• Full demobilization of 51⁄8” SIL in order to mobilize
71⁄16” SIL for Tartan well
• P&A phase included full vessel demobilization of equipment to
accommodate key equipment for well abandonment
• A variety of Trees intervened through during the campaign:
Cameron; FMC and GE (Vetco)
• GE (Vetco) and Drill-Quip wellheads during P&A well-work
A subsea tree (below) connected to the Seawell’s IRS (above).
h e l i x w e l l o p s ta l i s m a n
Well Work Completed
• 3 LWI (Well Maintenance & Production Enhancement)
• 3 wells P&A’d (Decommissioning)
• 1 well scale-squeeze treatment (Production Enhancement)
CONCLUSION
Helix Well Ops (U.K.) successfully executed the cold weather (December to February) well campaign with a total uptime of 74.8 percent
(49.5 days) in water depths ranging from 90m – 141m. A variety of subsea well operations were carried out during the campaign
including three light-well intervention operations, three decommissioning operations and one well scale-squeeze treatment carried out
for production enhancement. Additionally, Helix Well Ops was able to access all of Talisman’s subsea wells which featured a variety of
Christmas trees including models fabricated by Cameron, FMC and GE (Vetco). These work scopes were supported with Saturation Diving
operations using the vessel’s onboard 18-man saturation diving complex. In the supplier performance survey completed at the end of the
campaign, the client reported excellent performance for service quality, management, planning and delivery.
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